Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd719bbf56dc41f…

MALICIOUS

PDF

92.8 KB Created: 2021-09-14 11:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c34e8203f3b63563955ff4cdc03d9010 SHA-1: 75e65653743d168b00bad7011969774484f12e84 SHA-256: ddd719bbf56dc41ff8f7f1c4138286c0e1a5aa222a46381a51cc42972ef71a0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, which are likely part of a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it's designed to lead users to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://kondicionery-himki.ru/upload_picture/file/mitobuw.pdf In PDF document text
    • http://medwin.kr/userData/board/file/puvelowef.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/savusukefigasur.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/gifuluv.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/50266071666.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/vilamivibuzedog.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210908_AFCFE6D453C6BBDC.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/zixizesavakud.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sobijusuw.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/regenaxomeluveko.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/871683224.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/14841003762.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/zavukepekav.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/89670543851.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/zixamubozekafej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137af07ee5c4---69497349809.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161343dd06aeba---jenur.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/82596012532.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/loruxevotamolaf.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/mumofevosofal.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/18994508127.pdfIn PDF document text
    • http://poliinc.com/upload/files/59637858788.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/sunosijeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=tlacaelel+el+azteca+entre+los+aztecas+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10343 10544 bytes
SHA-256: 55137365d13eab5f739fb16a0fd1b8573f38a01e09b48fbc19ef4256fbad7f25
font_01_sfnt_off00011b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7F 19604 bytes
SHA-256: 530001d163e8fba32a796b0d17ad68c7ffa95afdce6adcf5b29d112d23eb4941
font_02_sfnt_off00014db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1